diff --git a/services/mcp-server/src/modules/dev/changelog-tools.ts b/services/mcp-server/src/modules/dev/changelog-tools.ts
index b10d28e1..06e19b8a 100644
--- a/services/mcp-server/src/modules/dev/changelog-tools.ts
+++ b/services/mcp-server/src/modules/dev/changelog-tools.ts
@@ -2,6 +2,23 @@ import { z } from 'zod';
 import { registerTool } from '../tools/registry.js';
 import { platformFetch } from '../../lib/platform-client.js';
 
+type CommitFile = {
+  path: string;
+  additions: number;
+  deletions: number;
+};
+
+type ChangelogCommit = {
+  sha: string;
+  message: string;
+  author: string;
+  date: string;
+  prNumber?: number;
+  prTitle?: string;
+  prBody?: string;
+  files: CommitFile[];
+};
+
 registerTool({
   name: 'changelog.generate',
   description:
@@ -117,13 +134,13 @@ registerTool({
       };
 
       const categorized = commitsResponse.commits.reduce(
-        (acc: Record<string, any[]>, commit: any) => {
+        (acc: Record<string, ChangelogCommit[]>, commit: ChangelogCommit) => {
           const category = categorizeCommit(commit.message, commit.files);
           if (!acc[category]) acc[category] = [];
           acc[category].push(commit);
           return acc;
         },
-        {} as Record<string, any[]>
+        {} as Record<string, ChangelogCommit[]>
       );
 
       // Step 4: Generate changelog content
@@ -179,7 +196,7 @@ registerTool({
 
           md += `## ${categoryEmojis[category]} ${category.charAt(0).toUpperCase() + category.slice(1)} (${commits.length})\n\n`;
 
-          commits.forEach((commit: any) => {
+          commits.forEach((commit: ChangelogCommit) => {
             md += `### ${commit.prTitle || commit.message.split('\n')[0]}\n\n`;
             md += `**Commit:** \`${commit.sha.substring(0, 7)}\`\n`;
             md += `**Author:** ${commit.author}\n`;
@@ -190,15 +207,15 @@ registerTool({
             }
 
             const totalChanges = commit.files.reduce(
-              (sum: number, file: any) => sum + file.additions + file.deletions,
+              (sum: number, file: CommitFile) => sum + file.additions + file.deletions,
               0
             );
-            md += `**Changes:** +${commit.files.reduce((sum: number, f: any) => sum + f.additions, 0)} -${commit.files.reduce((sum: number, f: any) => sum + f.deletions, 0)} (${totalChanges} total)\n`;
+            md += `**Changes:** +${commit.files.reduce((sum: number, f: CommitFile) => sum + f.additions, 0)} -${commit.files.reduce((sum: number, f: CommitFile) => sum + f.deletions, 0)} (${totalChanges} total)\n`;
 
             // List modified files (limit to 10)
             const modifiedFiles = commit.files
               .slice(0, 10)
-              .map((f: any) => f.path)
+              .map((f: CommitFile) => f.path)
               .join(', ');
             md += `**Files:** ${modifiedFiles}${commit.files.length > 10 ? '...' : ''}\n`;